Bag clip applicator



y 1969 w. LE ROY BUSLER 3,

BAG CLIP APPLIGATOR 9 Sheets-Sheet 1 Filed Aug. 22, 1966 July 15, 1969 w. LE ROY BUSLER BAG CLIP APPLICATOR 9 Sheets-Sheet 2 Filed Aug. 22, 1966 July 15, 1969 w LE ROY BUSLER 3,455,010

BAG CLI P APPLICATOR Filed Aug. 22, 1966 9 Sheets-Sheet 5 w. LE ROY BUSLER 3,455,010

July 15, 1 969- BAG CLIP APPLICATOR 9 Sheets-Sheet 4 Filed Aug. 22; 1966 July 15, 1969 w. LE ROY BUSLER 3,455,010

BAG CLIP APPLICATOR Filed Aug. 22. 1966 9 Sheets$heet :3

IHHI 72 July 15, 1969 w LE RQY BUSLER 3,455,010

BAG CLIP APPLICATOR Filed Aug 22, 1966 9 Sheets-Sheet 6 y 15, 1969 w. LE ROY BUSLER 3,455,010

BAG CLIP APPLICATQR Filed Aug. 22, 1966 9 Sheets-Sheet 7 fM I W *5 J y 1959 w. LE ROY BUSLER 3,455,010

BAG CLIP APPLICATOR 9 Sheets-Sheet 8 Filed Aug. 22, 1966 y 1969 w. LE ROY BUSLER 3,

BAG CLIP APPLICATOR Filed Aug. 22, 1966 9 Sheets-Sheet 9 COM PRESS 3,455,010 BAG CLIP APPLICATOR Willard Le Roy Busler, Harrisburg, Pa., assignor to AMP Incorporated, Harrisburg, Pa. Filed Aug. 22, 1966, Ser. No. 574,090 Int. Cl. B65b 61/00 US. Cl. 29211 10 Claims ABSTRACT OF THE DISCLOSURE Apparatus is disclosed for applying a closure member to a bag or the like. A constricting passageway is provided in a frame through which a bag is moved to effect compression of a discrete portion of the bag. The compressed portion is nestled within an open closure member and subsequently the closure member is secured around the bag to yield an air tight and moisture tight seal.

This invention relates to the art of bag closures and more particularly to a new and novel apparatus for applying a closure means to a bag or the like.

In the commercial world there is an ever increasing use of plastic bags (e.g. polyethylene or the like) within which various products will be placed for shipment. The particular products contained in the bags are often of such a character that the bags must be effectively sealed against the ingress of air or moisture in order to protect the contents of the bag. The products within such bags may be typically food, various powder substances, explosive materials, etc.

Various closure means for such bags are known in the prior art. However, there has been extreme difficulty in providing suitable apparatus for applying the closure means to the bags in an effective manner. This operation is usually performed by hand. The problem arises when it is considered that the bag material within the closure means must be compressed to a degree whereat the bag material is essentially a solid mass in order to insure an airtight and watertight seal. It is extremely diflicult, if not impossible, to sufficiently compress the bag materials by hand. When the contents of the bags are explosive powders the bag material is extremely tough, making the compressing step all the more difficult.

It is therefore an object of the present invention to provide apparatus for rapidly and effectively applying a closure means to a bag or similar article.

A further object is to provide a means for exerting large compressive forces on the bag material within the closure member while protecting the bag material from rupture, tearing or the like.

A further object of the present invention is to provide closure applying apparatus which will effect an airtight and moisture tight seal on a bag or similar article.

Other objects and attainments of the present invention will become apparent to those skilled in the art upon a reading of the following detailed description when taken in conjunction with the drawings in which there is shown and described an illustrative embodiment of the invention; it is to be understood, however, that this embodiment is not intended to be exhaustive nor limiting of the invention but is given for purpose of illustration in order that others skilled in the art may fully understand the invention and the principles thereof and the manner of applying it in practical use so that they may modify it in various forms, each as may be best suited to the conditions of a particular use.

In the drawings, in which like reference numerals refer to like parts:

FIGURE 1 is an overall perspective view of the apparatus of the present invention;

United States Patent FIGURE 2 is a perspective view of a bag or similar article having a closure means applied by the apparatus of FIGURE 1;

FIGURE 3 is a top plan view illustrating the bag gathering means, parts being removed for clarity;

FIGURE 4 is a top plan view showing the drive mechanism for the bag compressing means and the closure applymg means;

FIGURE 5 is a top plan view of the closure transfer mechanism;

FIGURE 6 is a cross-sectional view taken along the line 66 of FIGURES 3 and 5 showing further details of the transfer mechanism;

FIGURE 7 is a cross-sectional view taken along the line 77 of FIGURE 3 showing details of the compressing mechanism;

FIGURE 8 is an enlarged plan view showing the various parts in their at rest position;

FIGURE 9 is an enlarged plan view showing a bag being gathered in the Work zone;

FIGURE 10 is an enlarged plan view showing the bag being compressed into the closure means;

FIGURE 11 is an enlarged plan view showing the closure means being applied to the bag;

FIGURE 12 is an enlarged plan view showing the parts in position after a closure has been effected;

FIGURE 13 is an enlarged plan view showing the parts just prior to completion of a cycle;

FIGURE 14 is a cross-sectional view taken along the line 14-14 of FIGURE 13 and showing details of the shearing mechanism for removing the closure means from its carrier strip;

FIGURE 15 is a side elevational view of the closure feeding means;

FIGURE 16 is a cross-sectional view taken along the line 1616 of FIGURE 15; and

FIGURE 17 is a flow diagram shown schematically illustrating the control for the various moving parts of the apparatus.

With reference to FIGURE 1 there is shown the overall apparatus of the present invention and comprises a frame 20 which will sit along the edge of a table, shelf or the like. A cover 22 is fitted over the frame to conceal the majority of the working parts of the apparatus. A supply reel 24 is located above the cover 22 and holds a supply of bag closure members 26 in strip form. The particular bag closure means employed, by way of example, is best shown in FIGURE 2 wherein the closure is shown in its final position about a bag 28 providing an effective airtight and moisture tight seal. The closure members 26 are fed through a guide means 30 which leads the closure members to the working area of the apparatus.

At the beginning of a cycle of operation an open bag is led by hand into the entrance way 32 of the machine. With the bag in position the operator will grasp a handle 34 (see also FIGURE 3) secured to a pair of upper and lower gather plates 36. The gather plates are pinned to and pivot about a shaft 38 and are normally biased in a clockwise direction by means of spring 40. By means of handle 34 the operator will swing the gather plates 36 in a counterclockwise direction whereby the open bag will be caught by the recessed portion 42 in the gather plates to urge the bag further into the entrance 32. The gather plates are spaced from each other in parallel relationship by a pair of fixed plates 44 secured to the machine frame 20'.

Between the gather plates a cam 37 is secured to shaft 38, the cam having a raised surface 37a at its trailing edge. The upper plate 44 has an air valve HV1 secured therein having an actuator 46 and a cam roller 48 which rides along the surface of cam 37. counterclockwise movement of the gather plates 36 causes like movement of cam 37. When raised surface 37a contacts roller 48 the roller will be displaced causing movement of actuator 46 thus actuating the valve HV1 to thereby actuate cylinder C3 (see also FIGURE 17). Cylinder C3 is pivotally connected to a toggle link 50 through an adjustment means 52. A connecting link 54 is pivotally connected to the toggle link at 56 and is pivotally connected at 58 to a link mount 60 which is fixed relative to the machine frame. A gather arm 62 is pivotally connected to the frame at 64 and is connected at 66 to the toggle link 50. A gathering block 68 is secured to the free end of gather arm 62 and is movable between a top and bottom plate 70 and 72 respectively, which plates confine the gathering block for movement between the gather plates 36.

Turning now to FIGURE 8 there is shown an open bag 28 positioned in the entrance way 32 by means of the gather plates 36. With the'bag in this position the gathering block 68 will swing behind the bag and force the bag against the rearward wall 74 of the entrance way 32 (see FIGURE 9). The entrance 32 has a dogleg portion 76 surrounding which is located the lowermost closure member 26 of the strip being fed.

In FIGURE 8 the various moving parts of the apparatus are shown in their initial position when the machine is at rest. The closure member 26 is positioned between a front terminal support 78 and a rear terminal support 80, the supports having inclined surfaces corresponding to the configuration of the closure member. An anvil 82 is positioned between the front and rear terminal supports and abuts the base of the closure member. In line with the rearward wall 74 is a guide 84 which serves to additionally locate the closure member in position. The guide 84 reciprocates between a pair of support plates 86 and 88. To the right of dogleg 76 as seen in FIGURE 8 there is located a compressor 90 and a crimping member 92. Straddling the front and rear terminal supports and the anvil 82 is a shear member 94 having a bifurcated end as further seen in FIGURE 14. A sequence of movement of the front and rear terminal supports 78 and 80 respectively, the anvil 82, the guide 84, the compressor 90, the crimping member 92, and the shear member 94 will now be described. The driving mechanisms for these various moving parts will be described hereafter.

As seen in FIGURE 9 the gathering block 68 has forced the bag into the end of passage 32. At this time a compressor 90 is actuated and reciprocates through the dogleg 76 to the position shown in FIGURE whereat the bag 28 is compressed under high force to an essentially solid mass. The compressed bag is located now within the closure member in position to be sealed.

Turning now to FIGURE 11 the guide 84 is retracted and the crimping member 92 is actuated and cooperates with the anvil 82 to crimp closure member 26 into an interlocking configuration to effect the permanent seal of the bag. Movement of the crimping member 92 has forced the front and rear terminal supports 78 and 80 out of the path of movement of the crimping member, these terminal supports being spring loaded in a fashion to be later described. With the closure having been effected the crimper 92, compressor 90, shear member 94, anvil 82, and the front and rear terminal supports 78 and 80 are moved to their retracted position shown in FIGURE 12. The retracting motion of the crimper 92 has a stripping effect on the completed closure causing the closure member 26 with its now sealed bag 28 to move into the main portion of the passageway 32 in position for removal from the machine. A new closure member 26a is now fed into position in front of the anvil 82, the member 26a still being connected to its strip as shown in FIGURE 1. The shear member 94, the front and rear terminal supports 78 and 80, and the guide 84 now move to their extended position as shown in FIGURE 13. As the anvil 82 moves from its position shown in FIGURE 13 to its next position shown in FIGURE 8, there is effected a shearing of the lowermost closure member from its strip, thus completing a cycle of operation of the machine. This shearing is best seen in FIGURE 14. The anvil 82 moves between the bifurcated ends of the shear member 94, with the upper and lower surfaces of the anvil 82 constituting shearing surfaces which cooperate with the inner surfaces of the shear member 94 to effect the shear.

Turning now to FIGURES l5 and 16 the closure member feed will be described. The strip of closure members is led downwardly through the terminal guide 30 into a feeding tube 96. The tube 96 is secured to a feed mount 98 fixed to the machine frame. Pivoted to the feed mount 98 is a feed lever 100. The lever 100 is connected to an air cylinder C7 through an adjusting means 102. The other end of the lever 100 is connected to a feed slide link 104, the slide link 104 being connected at its lower end to a feed slide 106. A pivoting finger 108 is connected to the slide 106 and is biased in a counterclockwise direction by means of spring 110. It can be seen that movement of the cylinder C7 causes oscillating movement of the lever 100 thereby imparting reciprocating movement to the feed slide 106. Downward movement of slide 106 causes the finger 108 to engage in a closure member 26 and feed the said closure member into the position shown in FIGURE 12. Upward movement of slide 106 causes the finger 108 to be cammed clockwise against the bias of spring 110 to allow the finger to ride over the next closure member in position for feeding during the next machine cycle. During the upward movement of slide 106 the strip of closure members is prevented from moving upwardly by means of a stop member 112 which is biased in a counterclockwise direction by the spring 114. The closure members will ride over the stop 112 during feeding movement of the strip.

Turning now to FIGURES 5 and 6 the anvil and the terminal supports will be described in detail. An air cylinder C4 is connected through an adjustment means 116 to a toggle lever 118. A toggle link 120 is pivotally secured at one end to the lever 118 and at its other end is adjustably secured to the machine frame by means of the adjustable clevis 122. The toggle lever 118 is pivotally secured within the bifurcated end of a transfer ram 124 slidable within a guideway 126 on the machine frame. The transfer ram 124 is provided with front and rear channels 128 within which are located springs 130 and spring stop members 132. The free end of springs 130 abut jaw sliders 134 which abut the rear surfaces of the front and rear terminal supports 78 and 80 respectively. It can be seen that rightward movement of the ram 124 causes the rightward movement of supports 78 and 80, this movement being effected by the resilient force exerted by the springs 130. A pickup jaw 136 is secured to the ram 124 and has an end 138 which cooperates with a depending portion 140 of the front and rear supports 78 and 80 to limit the forward movement of the supports 78 and 80 and also to effect retrograde movement of the supports upon retraction of the ram 124.

A two-part anvil ram 142 is provided and has secured thereto the anvil 82. The ram 142 carries a depending block 144 which engages a biasing spring 148, which spring urges the anvil ram 142 to the left or retracted position as seen in FIGURE 6. Rightward movement of the left upon retraction of transfer cylinder C4 the anvil ram 142 thus driving the anvil ram to the right to move the anvil 82 from the position shown in FIGURE 13 to that of FIGURE 8. As the transfer ram 124 is moved to the left upon retraction of transfer cylinder C4 the anvil ram 142 will move to the left under the influence of spring 148. Should the anvil ram become hung up in its slide way there is provided a return link which insures that the anvil ram 142 will move to its retracted leftward position at the completion of a machine cycle.

Turning now to FIGURE 3 there is shown a drive means for the shear member 94 and the guide member 84. An air cylinder C2 is connected through an adjusting means 152 to the rear end of the shear member 94. Reciprocation of cylinder C2 will cause like reciprocation of the shear member 94 causing the shear member to move between its position shown in FIGURE 12 and that shown in FIGURE 8.

An air cylinder C6 is connected through adjusting means 154 to the rear end of the guide member 84. Reciprocation of air cylinder C6 will cause like reciprocation of the guide 84 between its position shown in FIGURE 12 and that shown in FIGURE 8.

Turning now to FIGURES 4 and 7 there is shown the drive mechanisms for the compressor 90 and the crimping member 92. An air cylinder C5 is secured through adjusting means 156 to a compressor link 158. The link 158 is connected in toggle like fashion to an anchor link 160 pivotally secured to an anchor block 162 fixed to the machine frame. The compressor link 158 is also pivotally secured to a compressor lever 164 carrying a bearing 166 which is adjustably positioned relative to the machine frame. A clevis 168 cooperates with a threaded member 170 which extends through a positioning block 172 to effect an adjustment of the clevis 168 to thereby adjust the position of bearing 166 and thus the throw of lever 164. A pair of plates 174 are secured to the outer end of lever 164 and carry a pin 176 which engages the ends of the pair of bag compressors 90. In FIGURES 8 through 13 only one compressor 90 is shown whereas in reality there are two parallel compressors which straddle the crimping member 92. The compressors 90 are guided for rectilinear movement by a guideway 178 formed in the machine frame and by a pair of compressor guides 179 located on opposite sides of the compressors.

An air cylinder C1 is connected through adjusting means 180 to a toggle lever 182. The lever 182 is pivotally connected to a toggle link 184 which is pinned to the machine frame by an adjustable clevis 186. The lever 182 is further pivotally secured at 188 to the crimper ram 190. The crimper ram 190 has a first pair of slots 192 within which the compressors 90 reciprocate and a second slot 194 within which reciprocates the pin 196 which connects the plates 174 to the compressors 90. The compressor guides 179 are secured to the crimper ram 190 by screws or the like 198. A pair of retaining plates 200 and 202 are provided for guiding the reciprocation of the crimper ram 190 and the compressor guides 179. The crimping member 92 is secured to the forward end o crimper ram 190 by bolts or the like whereby reciprocation of the ram 190 causes direct reciprocation of the crimping member 92.

With reference now to FIGURE 17, the flow diagram and operational sequence of the apparatus will be described. Air is introduced into the system via lines L1. When the machine is at rest the hand valve HV1 is released and is in the position shown in the figure. This places air in lines L1, L3, L7, L9, L11, L13, L15, L17, and L19. The pilot valves PV1 through PV9 are all shifted to their B end. All the remaining lines are vented. Cylinder C1 is retracted causing relay valve RVl to be actuated and relay valve RV2 to be released. Cylinder C2 is extended causing relay valve RV3 to be released and relay valve RV4 to be actuated. Cylinder C3 is retracted causing relay valve RV5 to be actuated and relay valve RV6 to be released. Cylinder C4 is extended causing relay valve RV7 to be released and relay valve RV8 to be actuated. Cylinder C5 is retracted causing relay valve RV9 to be actuated and relay valve RV10 to be released. Cylinder C6 is extended causing relay valve RV11 to be released and relay valve RV12 to be actuated. Cylinder C7 is retracted causing relay valve RV13 to be actuated and relay valve RV14 to be released. This establishes all the elements in their at rest position as shown in the figure.

To begin a cycle of operation valve HV1 is actuated by the operator. This causes air to flow in line L2 causing valve PV1 to shift to its A end. The shifting of valve PV1 causes line L3 to be vented and causes air to flow in lines L4, L5, and L14. The air in line L4 causes valve PV3 to shift to the A end, placing air in line L8 and venting lines L7, L9, L11, L13, L15, L17, and L19. The air in line L14 causes cylinder C3 to be extended thereby releasing valve RV5 and actuating valve RV6. Actuation of valve RV6 causes air to flow in line L26, thereby placing air in line L18 to extend cylinder C5. The extension of cylinder C5 causes the release of valve RV9 and the actuation of valve RV10. The actuation of valve RV10 causes air to flow in line L30 which places air in line L20 to retract the cylinder C6. The retraction of cylinder C6 causes valve RV12 to be released and valve RV11 to be actuated. Actuation of valve RV11 places air in line L31. The air in line L20 has further caused the cylinder C7 to be extended thereby releasing valve RV13 and actuating valve RV14 to place air in line L34. The air in line L30 causes valve PV6 to shift to its A end which vents line L14 and places air in line L13 through its connection with line L8. The air in line L13 causes cylinder C3 to retract which again releases valve RV6 and actuates valve RV5 thereby venting lines L26 and L18 and placing air in lines L25 and L10. The air in line L10 causes cylinder C1 to extend thereby releasing valve RVI and actuating valve RV2. Valve RV2 places air in line L22 and thus in line L16 to retract cylinder C4 thereby releasing valve RV8 and actuating valve RV7. Valve RV7 places air in line L27 and the air in line L22 causes valve PV8 to shift to its A end placing air in line L17 to retract cylinder C5 to once more release valve RV10 and actuate valve RV9. The release of valve RV10 vents the line L30 and thus the line L20. The actuation of valve RV9 places air in line L29 and thus in line L12 to retract cylinder C2 th'us' releasing valve RV4 and actuating valve RV3. Valve RV3 places air in line L23 while the air in line L29 causes the valve PV4 to shift to its A end thus venting line L10 and placing air in line L9 to retract cylinder C1 thereby again releasing valve RV2 which vents lines L16 and L22 and actuating valve RVl which places air in line L21. The air in line L21 causes valve PV2 to shift to its A end thereby venting lines L5, L12, L21, L23, L25, L27, L29, L31, and L34 and placing air in line L6 which shifts valve PV9 to its A end placing air in line L19. The air in line L19 causes cylinder C6 to be extended thereby releasing valve RV11 and actuating valve RV12 to place air in line L32. The air in line L19 further causes cylinder C7 to retract thereby releasing valve RV14 and actuating valve RV13 to place air in line L33 thereby causing valve PVS to shift to its A end to place air in line L11. The air in line L11 causes cylinder C2 to extend to thereby release valve RV3 and actuate valve RV4 placing air in line L24 to shift valve PV7 to its A end and thus place air in line L15. The air in line L15 causes cylinder C4 to be extended to thereby release valve RV7 and actuate valve RV8 thereby placing air in line L28. By this point in the cycle the hand valve HV1 will have been released by the operator to thereby vent line L2. The air in line L28 causes the valve PV1 to shift to its B end andthereby venting lines L4, L6, L19, L24, L28, L32, and L33. Air is introduced into line L3 causing valve PV2 to shift to its B end and causing valve PV4 to shift to its B end thus venting line L9. The air in line L3 also causes valve PVS to shift to its B end thus venting line L11, causes valve PV6 to shift to its B end thus venting line L13, causes valve PV7 to shift to its B end thus venting line L15, causes valve PV8 to shift to its B end thus venting line L17, causes valves PV9 and PV3 to shift to their B end venting line L8. Air remains in lines L7, L9, L11, L13, L15, L17, and L19 thus placing us back in the original condition of rest for the machine system.

The cylinders C1 through C7 are labeled in FIGURE 17 corresponding to the apparatus which they control,

7 cylinder C1 controlling the crimping apparatus, cylinder C2 controlling the shearing apparatus, etc. Through the above-described sequence of air flow through the system one can readily ascertain the sequence of operation of the various moving parts of the apparatus. A timing valve TV1 is shown in line L3 in FIGURE 17. Similar timing valves may be placed in appropriate lines in order to control the timing of the extension and retraction of the various cylinders.

Changes in construction will occur to those skilled in the art and various apparently different modifications and embodiments may be made without departing from the scope of the invention. The matter set forth in the foregoing description and accompanying drawings is offered by way of illustration only. The actual scope of the invention is intended to be defined in the following claims when viewed in their proper perspective against the prior art.

What is claimed is:

1. Apparatus for applying a closure member to a bag or the like comprising a frame, a passageway located in said frame, means for positioning an open closure member in said passageway, compressing means for moving a portion of a bag along said passageway and for compressing said portion into a substantially solid mass within said open closure member, and means for securing said closure member about the compressed portion of said bag subsequent to operation of said compressing means.

2. Apparatus as set forth in claim 1 further comprising additional means to partially compress said bag portion prior to operation of said compressing means.

3. Apparatus as set forth in claim 2 wherein said compressing means is operative to move said bag portion from a first station at which said bag is partially compressed to a second station at which said open closure member is located. 1

4. Apparatus for applying a closure member to a bag or the like comprising a confined passageway, means for engaging a bag to move said bag into said passageway, means responsive to movement of said engaging means for gathering said bag into position adjacent an end of said passageway, means responsive to movement of said gathering means for compressing a portion of said bag into a substantially solid mass, and means responsive to movement of said compressing means for securing a closure member about the compressed portion of said bag to effect an airtight and moisture tight seal.

5. Apparatus for applying a closure member to a bag or the like comprising a confined passageway, means for feeding a closure member in strip form to a position adjacent said passageway, means for supporting said closure member on opposite sides thereof, means for shearing the said closure member from said strip, means for transferring said closure member into position at said passageway, means for engaging a bag to move said bag into said passageway, means responsive to movement of said engaging means for gathering said bag into position adjacent an end of said passageway, means responsive to movement of said gathering means for compressing a portion of said bag into a substantially solid mass within said closure member, said supporting means being operative to prevent the distortion of said closure member during the compressing operation, and means responsive to movement of said compressing means for securing said closure mem- 8 ber about the compressed portion of said bag to effect an airtight and moisture tight seal.

6. Apparatus for applying a closure member to a bag or the like comprising a frame, a passageway located in said frame for permitting entrance of a bag therein, supply means mounted on said frame for supplying bag closure members in strip form, feed means mounted on said frame and operative to feed said strip of closure members in intermittent manner towards said passageway, means slidably mounted on said frame and operative to shear the lower most one of said closure members from said strip, transfer means slidably mounted on said frame and operative to transfer said lower most closure member into bag receiving position at said passageway, gathering means swingably mounted on said frame for urging a bag into said passageway, means responsive to movement of said gathering means for pushing said bag into an end of said passageway at a position adjacent said closure member, compressing means slidably mounted on said frame and operative to push said bag into said closure member to effectively compress a portion of said bag into a substantially solid mass, means located behind said closure member for supporting said closure member during said compressing operation, and means slidably movable along said frame for securing said closure member about the compressed portion of said bag to effect an airtight and moisture tight seal.

7. Apparatus as set forth in claim 6 wherein said closure member supporting means is spring biased into position around said closure member and wherein said se curing means is movable past said supporting means to push said supporting means away from said closure member against the bias on said supporting means.

8. Apparatus as set forth in claim 6 wherein said shearing means straddles said supporting means and said transfer means and wherein shearing of the closure member is effected through the cooperation of said shearing means and said transfer means.

9. Apparatus as set forth in claim 6 wherein said compressing means comprises a pair of movable members operative to engage said bag and apply force to said bag on opposite sides of said closure member to thereby compress the portion of said bag lying between said compressing members and within said closure member.

10. Apparatus as set forth in claim 6 further comprising guide means movable into position adjacent said passageway for locating said closure member at said passageway in bag receiving position.

References Cited UNITED STATES PATENTS 2,866,975 1/ 1959 Ine 29-33.5 2,879,512 3/ 1959 Tipper.

2,880,419 4/1959 Tipper 29-243.57 2,972,747 2/ 1961 Kelem.

2,986,809 6/1961 Focht 29-211 3,054,170 9/1962 Benichasa et al.

3,237,290 3/1966 Frank 29-24357 THOMAS H. EAGER, Primary Examiner US. Cl. X.R. 

